A Brooklyn man convicted of stabbing his longtime girlfriend to death in front of their 13-year-old son tried to say sorry in court before he was sentenced Thursday — but was repeatedly shouted down by his victim’s family.

“I’m really sorry this happened. I was drunk,” said Eustachio Roberts, 58.

“No!” the family of Maritza Jolliffe, 53, replied in unison.

“I’m really, really sorry. I made a mistake,” he tried again.

“You’re sorry? You’re still trying to play crazy!” cried out a female relative.

Roberts was convicted of the 2010 killing after his son bravely took the stand earlier this month to describe how his father stabbed his mother to death in their Canarsie home.

“I pray that this next stage of your life be long, arduous and torturous,” the dead woman’s sister, Gloria Flowers, said in an victim-impact statement in Brooklyn Supreme Court. “May each day pass as slow as a year.”